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Revision of ECE R41

First analysis of the Informal GRB R41 TF database By Heinz Steven 23.10.2006. Revision of ECE R41. 44 vehicles 11 from Japan, 5 from ACEM, 11 from INDIA, 2 from USSMA, 15 from BASt No results from INDIA for current ECE R41, Detailed results (single measurements) for

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Revision of ECE R41

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  1. First analysis of the Informal GRB R41 TF database By Heinz Steven 23.10.2006 Revision of ECE R41

  2. 44 vehicles 11 from Japan, 5 from ACEM, 11 from INDIA, 2 from USSMA, 15 from BASt No results from INDIA for current ECE R41, Detailed results (single measurements) for ECE R41 from Japan and ACEM, ISO 362-2 from Japan and ACEM, ASEP from Japan, ACEM, INDIA, USSMA, Roadside enforcement from Japan, ACEM The following tables show the technical data of the vehicles. Content and structure

  3. Table 1a Technical data

  4. Table 1b Technical data

  5. Table 1c Technical data

  6. The following figures show the detailed results for all methods versus engine speed per vehicle. Results

  7. Figure 1 Detailed results versus engine speed

  8. Figure 2 Detailed results versus engine speed

  9. Figure 3 Detailed results versus engine speed

  10. Figure 4 Detailed results versus engine speed

  11. Figure 5 Detailed results versus engine speed

  12. Figure 6 Detailed results versus engine speed

  13. Figure 7 Detailed results versus engine speed

  14. Figure 8 Detailed results versus engine speed

  15. Figure 9 Detailed results versus engine speed

  16. Figure 10 Detailed results versus engine speed

  17. Figure 11 Detailed results versus engine speed

  18. Figure 12 Detailed results versus engine speed

  19. Figure 13 Detailed results versus engine speed

  20. Figure 14 Detailed results versus engine speed

  21. Figure 15 Detailed results versus engine speed

  22. The following figures contain comparisons of the results for different methods. Comparison of results

  23. Figure 16 L_urban versus L_ECE R41

  24. Figure 17 L_urban, L_ECE R41 versus power to mass ratio

  25. Figure 18 ISO 362-2: Lwot versus Lcst

  26. Figure 19 L_ASEP, L_enforcement versus Lwot (ISO 362-2)

  27. For 14 vehicles of the TUEV Nord motorcycle database (derived within UBA projects) and 9 vehicles of the Informal GRB R41 TF database the slopes of the linear regression lines of Lmax versus engine speed and versus normalised engine speed ((n – n_idle)/(s – n_idle)) were calculated for each side of the vehicle. The results show an influence of rated engine speed as demonstrated in the following figures. The slopes decrease with increasing rated_speed for the absolute engine speeds and increase with increasing rated speed for the normalised speeds. Tolerance bands can be determined that could be used for ASEP requirements. Slope of Lmax versus engine speed

  28. Figure 20 Slopes of the linear regression lines of Lmax versus engine speed

  29. Figure 21 Slopes of the linear regression lines of Lmax versus engine speed

  30. Within a project for the UBA TUEV Nord tested some motorcycles with original and replacement silencers. Some of the replacement silencers showed noise emissions that were similar to the original equipment but could be easily modified so that the noise emission was increased between 7 and 13 dB(A). This modification makes the silencer illegal. However, an advanced silencer whose noise emission up to engine speeds that are covered by ISO 362-2 are similar to the original equipment but switches to the illegal mode at higher engine speeds would no longer be illegal without ASEP The following figure shows an example based on measurement results. Example for ASEP

  31. Figure 22 Example for the necessity for ASEP

  32. Thank You Revision of ECE R41

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